Nonlinear Optical Effects in Pure and N-Doped Semiconductors

Donlagic, Nias Sven

dc.contributor.advisor	Schönhammer, Kurt Prof. Dr.	de
dc.contributor.author	Donlagic, Nias Sven	de
dc.date.accessioned	2000-12-13T15:34:34Z	de
dc.date.accessioned	2013-01-18T13:32:17Z	de
dc.date.available	2013-01-30T23:51:03Z	de
dc.date.issued	2000-12-13	de
dc.identifier.uri	http://hdl.handle.net/11858/00-1735-0000-0006-B5A1-1	de
dc.identifier.uri	http://dx.doi.org/10.53846/goediss-2679
dc.format.mimetype	ContentType:application/pdf Size:1027	de
dc.language.iso	eng	de
dc.rights.uri	http://webdoc.sub.gwdg.de/diss/copyrdiss.htm	de
dc.title	Nonlinear Optical Effects in Pure and N-Doped Semiconductors	de
dc.type	doctoralThesis	de
dc.contributor.referee	Kree, Reiner Prof. Dr.	de
dc.date.examination	2000-11-02	de
dc.subject.dnb	530 Physik	de
dc.description.abstracteng	Over the last decades, the nonlinear optical properties of condensed matter systems have been an attractive and fruitful field of research. While the linear response functions of solids provide information about the elementary excitations of the systems, nonlinear optical experiments give insight into the dynamics of the fundamental many-body processes which are initiated by the external excitations. Stimulated by the experimental results, new theoretical concepts and methods have been developed in order to relate the observed phenomena to the microscopic properties of the investigated materials. The present work deals with the study of the nonlinear dynamics of the optical interband polarization in pure and n-doped semiconductors.In the first part of the thesis, the relaxation behavior of optically excited electron-hole pairs in a one-dimensional semiconductor, which are coupled to longitudinal optical phonons with an initial lattice temperature T>0, is studied with the help of quantum kinetic equations. Apart from Hartree-Fock-like Coulomb contributions, these equations contain additional Coulomb terms, the so-called vertex corrections, by which the influence of the electron-electron interaction on the electron-phonon scattering processes is taken into account. The numerical studies indicate that the vertex corrections are essential for a correct description of the excitonic dynamics.In the second part of the thesis, the attention is shifted to the characteristics of the optical response of a one-dimensional n-doped two-band semiconductor whose conduction band has been linearized with respect to the two Fermi points. Due to the linearization it is possible to calculate the linear and nonlinear response functions of the interacting electron system exactly. These response functions are then used in order to determine the linear absorption spectrum and the time-integrated signal of a degenerated four-wave-mixing experiment. It is shown that the well-known features of the linear response can directly be related to features of the nonlinear experiments. For example, the exponent which describes the algebraic decay of the time-integrated four-wave-mixing signal is functionally dependent on the exponent of the algebraic singularity in the linear absorption spectrum reflecting the common origin of the different phenomena.	de
dc.subject.topic	Mathematics and Computer Science	de
dc.subject.eng	quantum kinetic equations	de
dc.subject.eng	phonons	de
dc.subject.eng	excitons	de
dc.subject.eng	Fermi-edge singularity	de
dc.subject.eng	Tomonaga-Luttinger model	de
dc.subject.eng	four-wave-mixing	de
dc.subject.bk	33.10	de
dc.identifier.urn	urn:nbn:de:gbv:7-webdoc-864-3	de
dc.identifier.purl	webdoc-864	de
dc.affiliation.institute	Fakultät für Physik	de
dc.subject.gokfull	RDI 800: Vielteilchenproblem {Theoretische Physik}	de
dc.subject.gokfull	RVQ 000: Halbleiter {Physik}	de
dc.identifier.ppn	50268433X	de

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